To create the triangle, left click once and drage to create the base in any desired direction. Then move the curser up (or down) to create the peak of the triangle. You have now created an pedal triangle. Notice that the orthocenter of the larger triangle is also the incenter of the smaller triangle. Some people also call the smaller triangle a pedal triangle. You can also play with the one I have already created to see what happens to both triangles as the size changes. Enjoy!